/*
* Copyright 2011 Pavel Kozhin 
*
* Licensed under the Apache License, Version 2.0 (the "License"); 
* you may not use this file except in compliance with the License. 
* You may obtain a copy of the License at 
* 
* http://www.apache.org/licenses/LICENSE-2.0
* 
* Unless required by applicable law or agreed to in writing, software 
* distributed  under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
* See the License for the specific language governing permissions and 
* limitations under the License.
*
* Author: Pavel Kozhin.
*/
package org.etherframework.controller
{
	import mx.rpc.IResponder;
	
	public final class Responder implements IResponder
	{
		private var _result:Function;
		private var _fault:Function;
		private var _executed:Boolean;
		
		public function Responder(result:Function = null, fault:Function = null)
		{
			if (!((result is Function) || (fault is Function)))
				throw new ArgumentError("At lease one argument should be not null.");
			
			_result = result;
			_fault = fault;
		}
		
		public function result(data:Object):void
		{
			execute(_result, data);
		}
		
		public function fault(info:Object):void
		{
			execute(_fault, info);
		}
		
		private function execute(_result:Function, data:Object):void
		{
			if (_executed)
				return;
			
			if (_result is Function)
				_result(data);
			
			_executed = true;
		}
	}
}